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| 型號： | Q67120-C508 |
| 英文描述： | IC-SM-8-BIT CPU 12-MHZ |
| 中文描述： | 集成電路釤8位CPU的12兆赫 |
| 文件頁數： | 30/121頁 |
| 文件大小： | 1000K |
| 代理商： | Q67120-C508 |
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Semiconductor Group
4-3
External Bus Interface
C501
4.1.2 Timing
The timing of the external bus interface, in particular the relationship between the control signals
ALE, PSEN, RD, WR and information on port 0 and port 2, is illustated in
figure 4-1 a)
and
b)
.
Data memory:
in a write cycle, the data byte to be written appears on port 0 just before WR is
activated and remains there until after WR is deactivated. In a read cycle, the
incoming byte is accepted at port 0 before the read strobe is deactivated.
Program memory: Signal PSEN functions as a read strobe.
4.1.3 External Program Memory Access
The external program memory is accessed under two conditions:
– whenever signal EA is active (low) or
– whenever the program counter (PC) contains a number that is larger than 1FFFH.
This requires the ROM-less version C501-L to have EA wired low to allow the lower 8K program
bytes to be fetched from external memory.
When the CPU is executing out of external program memory, all 8 bits of port 2 are dedicated to an
output function and may not be used for general-purpose I/O. The contents of the port 2 SFR
however is not affected. During external program memory fetches port 2 lines output the high byte
of the PC, and during accesses to external data memory they output either DPH or the port 2 SFR
(depending on whether the external data memory access is a MOVX @DPTR or a MOVX @Ri).
When the C501 executes instructions from external program memory, port 2 is at all times
dedicated to output the high-order address byte. This means that port 0 and port 2 of the C501 can
never be used as general-purpose I/O. This means that port 0 and port 2 of the C501-L can never
be used as general-purpose I/O. This also applies to the C501-1R/1E when they are operating with
external program memory only.
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